SafetyNet Attestation Bypass

attestation.md

SafetyNet Attestation Bypass

Proof that with a few hours work, you can easily provide aribitrary data to the Google SafetyNet API and receive a valid Attestation signed by attest.android.com.

I've captured the HARDWARE_BACKED flag. Check this comment.

This is only a software backed attestation, as you can see with the evaluationType=BASIC. I don't have any devices that support hardware backed attestations via TEE, however once I do, I'll be taking a look into them 🤠

• nonce: base64(liam@liamcottle.com)
• packageName: liam@liamcottle.com
• apkDigest: base64(liam@liamcottle.com)
• apkCertificateDigest: base64(liam@liamcottle.com)

{
  "nonce": "bGlhbUBsaWFtY290dGxlLmNvbQ==",
  "timestampMs": 1626261636009,
  "apkPackageName": "liam@liamcottle.com",
  "apkDigestSha256": "bGlhbUBsaWFtY290dGxlLmNvbQ==",
  "ctsProfileMatch": true,
  "apkCertificateDigestSha256": [
    "bGlhbUBsaWFtY290dGxlLmNvbQ=="
  ],
  "basicIntegrity": true,
  "evaluationType": "BASIC"
}

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.eyJub25jZSI6ImJHbGhiVUJzYVdGdFkyOTBkR3hsTG1OdmJRPT0iLCJ0aW1lc3RhbXBNcyI6MTYyNjI2MTYzNjAwOSwiYXBrUGFja2FnZU5hbWUiOiJsaWFtQGxpYW1jb3R0bGUuY29tIiwiYXBrRGlnZXN0U2hhMjU2IjoiYkdsaGJVQnNhV0Z0WTI5MGRHeGxMbU52YlE9PSIsImN0c1Byb2ZpbGVNYXRjaCI6dHJ1ZSwiYXBrQ2VydGlmaWNhdGVEaWdlc3RTaGEyNTYiOlsiYkdsaGJVQnNhV0Z0WTI5MGRHeGxMbU52YlE9PSJdLCJiYXNpY0ludGVncml0eSI6dHJ1ZSwiZXZhbHVhdGlvblR5cGUiOiJCQVNJQyJ9.EnoaJJcMSdVJdiuo91eq227Aa9NFxsL0wj0Z2qhLG-fJ_WtEoLFfYURqPKw_loxVre1_lZ6PUC7FdFIGUEaryFE2UWRZBEosqoimwjLlrOTZ45DrrW3yga5R1einNb_NEll5jB0D7PZpckQBAIWqzdPSyllmH_-GXj7xnkwaPDtdBP_o3AQ3E0_XDk0z-lR3Ta0pB2wn3wPdkgfy7PK5rzDJHK0-UikJRE3sgWB-hye-rOrjF0LemQ0ssStwOMxBadIsdtzkggxQ1Xcs-VityOaje8CU-zJAZp5fcqXUB-bGhDdGKjjeEQmbmlMH6vww89YOgzSeYLYIxYlckN-ujA

Nice, I had a very similar idea. Since the server can not know whether the client request is genuine or not. Basic is already defeated though so it would be a breakthrough if you defeat hardware backed attestation

it would be a breakthrough if you defeat hardware backed attestation

I wouldn't say I've defeated hardware backed attestation, but I took a look at this for a couple days and I'm able to get a valid attestation signed by Google with the HARDWARE_BACKED flag also containing arbitrary attestation data. Felt like an intense CTF challenge lmao.

Here's the signed attestation and the decoded data. I've used my email as the attestation data if anyone wants to get in touch about it.

{
  "nonce": "bGlhbUBsaWFtY290dGxlLmNvbQ==",
  "timestampMs": 1635481940965,
  "apkPackageName": "liam@liamcottle.com",
  "apkDigestSha256": "bGlhbUBsaWFtY290dGxlLmNvbQ==",
  "ctsProfileMatch": true,
  "apkCertificateDigestSha256": [
    "bGlhbUBsaWFtY290dGxlLmNvbQ=="
  ],
  "basicIntegrity": true,
  "evaluationType": "BASIC,HARDWARE_BACKED"
}

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may you describe detail approach how you did this and decoded response ?

Can you detail the procedure so I can create a magisk module to bypass this?